Definitions from Wiktionary (back channel)

▸ noun:  The smaller of two channels in a river that diverge to form an island.
▸ noun:  A secondary channel of activity, typically in parallel with primary channels and somewhat independent of them.
▸ noun:  An unofficial communications channel used to make informal or subversive negotiations.
▸ noun:  (computing) A real-time online discussion that occurs simultaneously with a verbal presentation.
▸ noun:  (linguistics) A gesture or short prompt by which a listener invites a speaker to continue.
▸ Also see back_channel


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